Electronic Apparatus and Method for Verifying Encrypted Data

1. A verification method of an electronic apparatus, comprising: transmitting encrypted quotient polynomial rings to an external device; receiving, from the external device, a result value calculated through an operation process for at least one layer on the basis of the transmitted encrypted polynomial rings; transmitting a random value to the external device, and receiving claim data obtained by performing the operation process in a reverse order on the basis of the random value from the external device; and verifying the received result value on the basis of a value of the quotient polynomial rings corresponding to the random value and the received claim data.

2. The verification method as claimed in claim 1, further comprising transmitting coefficient information of the quotient polynomial rings to the external device, and wherein the receiving of the claim data comprises receiving claim data obtained by performing the operation process in the reverse order on the basis of the coefficient information.

3. The verification method as claimed in claim 1, further comprising: receiving operation-related information and operation data of each of the at least one layer; and verifying the operation data of each of the at least one layer on the basis of the received operation-related information.

4. The verification method as claimed in claim 3, wherein the receiving of the operation-related information and the operation data and the verifying of the operation data comprise sequentially receiving the operation-related information and the operation data and verifying the operation data in the order from an initial layer to a last layer among the at least one layer.

5. The verification method as claimed in claim 4, wherein the operation-related information comprises at least one of arithmetic expression information or coefficient information.

6. The verification method as claimed in claim 5, wherein, when the operation-related information is the arithmetic expression information, the verifying of the operation data comprises performing a modular arithmetic on the arithmetic expression information, and verifying the operation data on the basis of a relationship between the arithmetic expression information on which the modular arithmetic is performed and the received operation data.

7. The verification method as claimed in claim 1, wherein each of the quotient polynomial rings comprises a polynomial for performing a modular arithmetic on a general polynomial ring.

8. An electronic apparatus comprising: a communication interface; and a processor, wherein the processor is configured to: control the communication interface to transmit encrypted quotient polynomial rings to an external device, receive from the external device a result value calculated by performing an operation process for at least one layer on the basis of the encrypted quotient polynomial rings, transmit a random value to the external device, and receive claim data obtained by performing the operation process in a reverse order on the basis of the random value from the external device; and verify the received result value on the basis of a value of the quotient polynomial rings corresponding to the random value and the received claim data.

9. The electronic apparatus as claimed in claim 8, wherein the processor is further configured to control the communication interface to transmit coefficient information of the quotient polynomial rings to the external device and receive claim data obtained by performing the operation process in the reverse order on the basis of the coefficient information.

10. The electronic apparatus as claimed in claim 8, wherein the processor is further configured to control the communication interface to receive operation-related information and operation data for each of the at least one layer, and verify the operation data of each of the at least one layer on the basis of the received operation-related information.

11. The electronic apparatus as claimed in claim 10, wherein the processor is further configured to sequentially receive and verify the operation-related information and the operation data in the order from a last layer to an initial layer among the at least one layer.

12. The electronic apparatus as claimed in claim 11, wherein the operation-related information comprises at least one of arithmetic expression information or coefficient information.

13. The electronic apparatus as claimed in claim 12, wherein, when the operation-related information is the arithmetic expression information, the processor is further configured to perform a modular arithmetic on the arithmetic expression information and verify the operation data on the basis of a relationship between the arithmetic expression information on which the modular arithmetic is performed and the received operation data.

14. The electronic apparatus as claimed in claim 8, wherein each of the quotient polynomial rings comprises a polynomial for performing a modular arithmetic on a general polynomial ring.

15. A non-transitory computer-readable storage medium storing a program for performing a verification method of an electronic apparatus, wherein the verification method comprises: transmitting encrypted quotient polynomial rings to an external device; receiving, from the external device, a result value calculated through an operation process for at least one layer on the basis of the transmitted encrypted quotient polynomial rings; transmitting a random value to the external device and receiving claim data obtained by performing the operation process in a reverse order on the basis of the random value from the external device; and verifying the received result value on the basis of a value of the quotient polynomial rings corresponding to the random value and the received claim data.